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Effects of habitat destruction in a prey-predator metapopulation model

A mean field, metapopulation model of a predator–prey interaction is developed in order to understand the consequences of habitate destruction at different trophic levels. Such a model allows is to explore different ecological scenarios (donor control vs. top-down control) by changing a single parameter. The response to habitat destruction is qualitatively the same for both predator and prey, although there are interesting differences linked to the trophic position. A similar decrease in the colonization rates affects the two species quite differently.

Mapping the regional transition to cyclicity in Clethrionomys rufocanus: Spectral densities and functional data analysis

We study the regional transitions in dynamics of the gray-sided vole,Clethrionomys rufocanus, within Hokkaido, Japan. The data-set consists of 225 time series of varying length (most from 23 to 31 years long) collected between 1962 and 1992 by the Forestry Agency of the Japanese Government. To see clearly how the periodic behavior changes geographically, we estimate the spectral density functions of the growth rates of all populations using a log-spline method. We subsequently apply functional data analysis to the estimated densities.

The selection mosaic and diversifying coevolution between crossbills and lodgepole pine

Asymmetrical competition determines which of two seed predators drives the evolution of lodgepole pine (Pinus contorta ssp. latifolia) cones. Red squirrels (Tamiasciurus hudsonicus) are effective preemptive competitors in lodgepole pine forests so that red crossbills (Loxia curvirostra) are uncommon and selection from Tamiasciurus drives cone evolution. When Tamiasciurus are absent, crossbills increase in abundance and coevolve in an evolutionary arms race with pine.

Does immune challenge affect torpor duration?

Competitive reversals inside ecological reserves: The role of external habitat degradation

The need for large-scale experimentation to assess and predict the response of ecosystems to perturbation

Extraction and amplification of mitochondrial DNA from formalin-fixed deep-sea mollusks

Predators, parasitoids, and pathogens as mortality agents in phytophagous insect populations

The value of the world's ecosystem services and natural capital

The value of ecosystem services: Putting the issues in perspective